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Research Papers

Power Augmentation in a Kalina Power Station for Medium Temperature Low Grade Heat

[+] Author and Article Information
N. Shankar Ganesh

Department of Mechanical Engineering,
Kingston Engineering College,
Vellore 632 059, Tamil Nadu, India

T. Srinivas

CO2 Research and Green Technologies Centre,
Energy Division,
School of Mechanical and Building Sciences,
Vellore Institute of Technology (VIT) University,
Vellore 632 014, Tamil Nadu, India
e-mail: srinivastpalli@yahoo.co.in

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received April 26, 2012; final manuscript received November 20, 2012; published online April 29, 2013. Assoc. Editor: Markus Eck.

J. Sol. Energy Eng 135(3), 031010 (Apr 29, 2013) (10 pages) Paper No: SOL-12-1111; doi: 10.1115/1.4023559 History: Received April 26, 2012; Revised November 20, 2012

Kalina cycle system (KCS) has an efficient heat recovery especially at low and medium temperatures. The current work focuses on thermodynamic development and assessment of a new KCS configuration to augment the power from a heat recovery of solar thermal collectors. Since, the separator is located at low pressure side; there is no need of throttling device in the proposed plant layout. Nearly 130% of extra working fluid has been found in turbine for expansion against the decreased amount in regular design. Strong solution concentration, separator temperature and turbine inlet condition (pressure and concentration) have been identified as key parameters for the plant evaluation. The performance (specific power and efficiencies) is improving with an increase in strong solution concentration and turbine inlet pressure. But it is decreasing with an increase in separator temperature and turbine concentration. At the maximum value of strong solution concentration, turbine inlet pressure and at the minimum separator temperature and turbine concentration, cycle efficiency, plant efficiency and specific power have been found as 20%, 7.5%, and 270 kW, respectively.

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Figures

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Fig. 1

Processes flow diagram of an augmented Kalina power plant with solar concentration collectors, CFP: condensate feed pump; CND: condenser; CW in: cooling water in; CW out: cooling water out; ECO: economizer; EVA: evaporator; HE: heat exchanger; MXR: mixture; MXT: mixture turbine; SEP: separator; SH: superheater; and SPL: splitter

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Fig. 2

(a) Enthalpy-concentration and (b) temperature-entropy diagram for a Kalina power cycle with reference to the process flow diagram shown in Fig. 1

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Fig. 3

Looping of total plant fluid flows for mass balance, MXR = mixture; and SEP = separator

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Fig. 4

Changes in (a) process conditions and (b) and (c) performance in a solar thermal power plant with strong solution concentration and separator temperature at 50 bar turbine inlet pressure and 0.8 turbine concentration

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Fig. 5

Changes in (a) process conditions and (b) and (c) performance of solar thermal power plant with strong solution concentration and turbine concentration at 75 °C of separator temperature and 50 bar of turbine inlet pressure

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Fig. 6

Variations in (a) plant conditions and (b) and (c) performance levels with strong solution concentration and turbine pressure at 75 °C separator temperature and 0.8 turbine concentration

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Fig. 7

Influence of solar beam radiation with turbine inlet pressure on (a) plant performance, (b) collectors area, and (c) cost at 0.9 strong solution concentration, 0.8 turbine concentration, and 75 °C of separator temperature

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Fig. 8

Variations in Kalina cycle exergy efficiency with strong solution concentration, (a) separator temperature, (b) turbine inlet concentration, and (c) turbine inlet pressure

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Fig. 9

Comparison of exergetic losses of cycle components

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